I'm just going to add some detail to this, and YR, feel free to correct me.
Ground strap says more timing
base ring says (Maybe) jetting is ok on top. but vary rich everywhere else.
Plug is to cold because there is no sign of heat on the threads. (top 3 threads should have some discolor to them).
Now that i have said all of this, you can't go by any of this without a new clean plug that has had a couple of 1/4 mile runs and then shut down clean at the end of the run.
